diff --git a/include/crypto/sm2.h b/include/crypto/sm2.h
index 7094d75ed54c..04a92c1013c8 100644
--- a/include/crypto/sm2.h
+++ b/include/crypto/sm2.h
@@ -13,7 +13,16 @@
 
 struct shash_desc;
 
+#if IS_REACHABLE(CONFIG_CRYPTO_SM2)
 int sm2_compute_z_digest(struct shash_desc *desc,
 			 const void *key, unsigned int keylen, void *dgst);
+#else
+static inline int sm2_compute_z_digest(struct shash_desc *desc,
+				       const void *key, unsigned int keylen,
+				       void *dgst)
+{
+	return -ENOTSUPP;
+}
+#endif
 
 #endif /* _CRYPTO_SM2_H */